Sample #1: 5 7 9 11

(7 x 9) (5 x 11) = 63 55 = 8

Sample #2: 1 3 5 7

(3 x 5) (1 x 7) = 15-7 = 8

Sample #3: 21 23 25 27

(23 x 25) (21 x 27) = 575 567 = 8

1st way:

w x y z

(x * y) (w * z) = 8

w + 2 = x x + 2 = y y + 2 = z

w = x 2

(x * (x+2)) ((x 2)(x + 4))

(x^2 + 2x) (x^2 + 4x 2x 8)

(x^2 + 2x) (x^2 + x -8) = 8

If x= 5 35-27 = 8 The rule works!

If x= 21 483-475 = 8 The rule works!

2nd way:

x= Any odd number

Each consecutive odd number you have to add 2 to x, than 4 to
x, than 6 to x to get your four consecutive odd counting numbers
to work with.

x+ x +2 x+4 x+6

((x + 2) (x +4)) (x (x + 6))

(x^2 + 6x + 8) (x^2 + 6x) = 8

x= 5 63-55 = 8 The rule works!

x= 21 575-567= 8 The rule works!